pengyu
/
tongyu_visu


			
				
					
						
						
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							<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>Proj4js</title>
  
  <style type="text/css">
    @import url(test/base.css);

    #descSource, #descDest {
        font-style: italic;
        color: #999;
    }
    
    #xySource, #xyDest {
        width: 100%;
    }
    
  </style>
  
  <script src="lib/proj4js.js"></script>
 
  <script src="lib/defs/EPSG27200.js"></script>
  <script src="lib/defs/EPSG4272.js"></script>
  <script src="lib/defs/EPSG54009.js"></script>
  <script src="lib/defs/EPSG42304.js"></script>
  <script src="lib/defs/EPSG25833.js"></script>
  <script src="lib/defs/EPSG27563.js"></script>
  <script src="lib/defs/EPSG4139.js"></script>
  <script src="lib/defs/EPSG4302.js"></script>
  <script src="lib/defs/EPSG31285.js"></script>
  <script src="lib/defs/EPSG900913.js"></script>
                      
  <script type="text/javascript">
  
  var projHash = {};
  function initProj4js() {
    var crsSource = document.getElementById('crsSource');
    var crsDest = document.getElementById('crsDest');
    var optIndex = 0;
    for (var def in Proj4js.defs) {
       projHash[def] = new Proj4js.Proj(def);    //create a Proj for each definition
       var label = def+" - "+ (projHash[def].title ? projHash[def].title : '');
       var opt = new Option(label, def);
       crsSource.options[optIndex]= opt;
       var opt = new Option(label, def);
       crsDest.options[optIndex]= opt;
       ++optIndex;
    }  // for
    updateCrs('Source');
    updateCrs('Dest');
  }
  
  function updateCrs(id) {
    var crs = document.getElementById('crs'+id);
    if (crs.value) {
      var proj = projHash[crs.value];
      var str = 'projection: ' + proj.projName + ' - datum: ' + proj.datumName;
      var desc = document.getElementById('desc'+id);
      desc.innerHTML = str;
      var units = document.getElementById('units'+id);
      units.innerHTML = proj.units;
    }
  }
  
  function transform() {
    var crsSource = document.getElementById('crsSource');
    var projSource = null;
    if (crsSource.value) {
      projSource = projHash[crsSource.value];
    } else {
      alert("Select a source coordinate system");
      return;
    }
    var crsDest = document.getElementById('crsDest');
    var projDest = null;
    if (crsDest.value) {
      projDest = projHash[crsDest.value];
    } else {
      alert("Select a destination coordinate system");
      return;
    }
    var pointInput = document.getElementById('xySource');
    if (pointInput.value) {
      var pointSource = new Proj4js.Point(pointInput.value);
      var pointDest = Proj4js.transform(projSource, projDest, pointSource);
      document.getElementById('xyDest').value = pointDest.toShortString();
    } else {
      alert("Enter source coordinates");
      return;
    }
  }
  
  </script>
</head>

<body onload="initProj4js()">
  <div id="header">
    <h1>Proj4js Home Page</h1>
  </div>
  <div id="navbar">
    <a href="http://trac.osgeo.org/proj4js">Proj4js Wiki/Trac</a> | 
    <a href="http://wiki.osgeo.org/wiki/MetaCRS">OSGeo MetaCRS</a> |
    <a href="http://spatialreference.org/">spatialreference.org</a> |
    <a href="http://communitymapbuilder.org/">MapBuilder</a> | 
    <a href="http://openlayers.org/">OpenLayers</a> | 
  </div>
  <h1>Welcome to Proj4js</h1>
  <p>
This is a JavaScript library that provides methods for coordinate 
transformations between map projections and longitude/latitude, 
including datum transformations, in a web client.
  </p>

  <p>
To use the Proj4js, you first create a source and destination Proj4js.Proj
objects, passing in a projection code (e.g. EPSG:4326).
You can then use the Proj4js.transform() method, passing in map XY as a point
object and the source and destination projection objects,
and it returns the point coordinate in the destination projection.
  </p>
  <form>
  <table>
    <tbody>
      <tr>
        <th colspan="3">source</th>
        <th></th>
        <th colspan="3">dest</th>
      </tr>
      <tr>
        <td>CRS:</td>
        <td colspan="2">
          <select name="crsSource" id="crsSource" onchange="updateCrs('Source')">
            <option value selected="selected">Select a CRS</option>
          </select>
        </td>
        <td></td>
        <td>CRS:</td>
        <td colspan="2">
          <select name="crsDest" id="crsDest" onchange="updateCrs('Dest')">
            <option value selected="selected">Select a CRS</option>
          </select>
        </td>
      </tr>
      <tr>
        <td></td>
        <td colspan="2" id="descSource">Projection - datum</td>
        <td></td>
        <td></td>
        <td colspan="2" id="descDest">Projection - datum</td>
      </tr>
      <tr>
        <td>x,y</td>
        <td><input name="xySource" id="xySource" type="text"/></td>
        <td id="unitsSource">units</td>
        <td><input type="button" value="--> transform -->" onclick="transform();"/></td>
        <td>x,y</td>
        <td><input name="xyDest" id="xyDest" type="text"></td>
        <td id="unitsDest">units</td>
      </tr>
      <tr>
        <td colspan="7" align="center"><input type="reset" value="reset"/></td>
      </tr>
    </tbody>
  </table>
  </form>
  <p>
For more information on Proj4js and to report bugs, please visit the 
<a href="http://trac.osgeo.org/proj4js">Proj4js Trac and Wiki</a> at OSGeo.
  </p>

</body>
</html>